Patent US3220235A successfully refreshed from Google Patents.
US3220235A
Expired / Lapsed
US
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Method and apparatus for making bulged articles
Assignee: National Lock Co
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Filing: 1961-09-19
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Granted: 1965-11-30
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Expires: 1981-09-19
Abstract
No abstract record available.
Inventors
- 👤 Peccerill Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:01
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/021; B21D26/031; B21D26/033; B21D26/049
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
AN APPARATUS FOR BULGING A CUP-SHAPED WORKPIECE BY HYDRAULIC PRESSURE COMPRISING A PAIR OF SIDES ADAPTED TO ENCLOSE THE WORKPIECE, A FLUID PRESSURE CYLINDER HAVING A REDUCED END ENGAGING AT LEAST ONE DIE AND SEALINGLY ENGAGING THE OPEN END OF SAID WORKPIECE, A PISTON SLIDABLY MOUNTED IN SAID CYLINDER, SAID REDUCE END OF THE CYLINDER HAVING A CENTRAL PASSAGE COMMUNICATING BETWEEN SAID CYLINDER AND SAID WORKPIECE, A NORMALLY CLOSED VALVE MEMBER POSITIONED IN THE PASSAGE AND SPRING-BIASED TO OPEN AT A PREDETERMINED PRESSURE, AND INLET AND OUTLET PORTS IN SAID CYLINDER FOR THE ENTRANCE OF FLUID AND EXHAUTION OF AID AND EXCESS FLUID, SAID PORTS POSITIONED ADJACENT THE UPPERMOST POSITION OF SAID PISTON TO METER THE FLUID IN SAID CYLINDER AND CLOSED BY DOWNWARD MOVEMENT OF SAID PISTON, DOWNWARD MOVEMENT OF SAID PISTON EXERTING PRESSURE ON THE THIRD TO CAUSE THE FLUID TO ENTER THE WORKPIECE UNDER PRESSURE AND EXPAND TO THE WORKPIECE WITHIN SAID DIES.
Claim 2
Independent Claim
156 words
AN APPARATUS FOR BULGING A CUP-SHAPED WORKPIECE BY HYDRAULIC PRESSURE COMPRISING A PAIR OF SIDES ADAPTED TO ENCLOSE THE WORKPIECE, A FLUID PRESSURE CYLINDER HAVING A REDUCED END ENGAGING AT LEAST ONE DIE AND SEALINGLY ENGAGING THE OPEN END OF SAID WORKPIECE, A PISTON SLIDABLY MOUNTED IN SAID CYLINDER, SAID REDUCE END OF THE CYLINDER HAVING A CENTRAL PASSAGE COMMUNICATING BETWEEN SAID CYLINDER AND SAID WORKPIECE, A NORMALLY CLOSED VALVE MEMBER POSITIONED IN THE PASSAGE AND SPRING-BIASED TO OPEN AT A PREDETERMINED PRESSURE, AND INLET AND OUTLET PORTS IN SAID CYLINDER FOR THE ENTRANCE OF FLUID AND EXHAUTION OF AID AND EXCESS FLUID, SAID PORTS POSITIONED ADJACENT THE UPPERMOST POSITION OF SAID PISTON TO METER THE FLUID IN SAID CYLINDER AND CLOSED BY DOWNWARD MOVEMENT OF SAID PISTON, DOWNWARD MOVEMENT OF SAID PISTON EXERTING PRESSURE ON THE THIRD TO CAUSE THE FLUID TO ENTER THE WORKPIECE UNDER PRESSURE AND EXPAND TO THE WORKPIECE WITHIN SAID DIES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |